除了我们之前介绍的 MSS、Window Scale 还有以一个非常重要的选项:时间戳(TCP Timestamps Option,TSopt)。这个选项在 TCP 头部的位置如下所示。 Timestamps 选项最初是在RFC 1323中引入的,这个 RFC 的标题是 "TCP Extensions for High Performance",在这个 RFC 中同时提出的还有 Window
TCP Timestamps Option (TSopt)具体设计如下 Kind:8// 标记唯一的选项类型,比如window scale是3Length:10bytes// 标记Timestamps选项的字节数+++++++++++++++++++++++++++++++++++ | Kind=8| Length=10| TSValue(TSval)| TS EChoReply(TSecr)| +++++++++++++++++++++++++++++++++++1...
假如web服务器开启了tcp的tcp_timestamps和tcp_tw_recycle这两个参数。那么存在下面这种情况 RFC1323中有如下一段描述: An additional mechanism could be added to the TCP, a per-hostcache of the last timestamp received from any connection.This value could then be used in the PAWS mechanism to rejec...
假如web服务器开启了tcp的tcp_timestamps和tcp_tw_recycle这两个参数。那么存在下面这种情况 RFC1323中有如下一段描述: An additional mechanism could be added to the TCP, a per-hostcache of the last timestamp received from any connection.This value could then be used in the PAWS mechanism to rejec...
TCP Timestamps 来自于 RFC1323,时间是 1992 年,当时 TCP 尚不支持 SACK。当 1996 年 RFC 2018 支持 SACK 后,使用 SACK 进行Recovery 状态 RTT 计算,就显得更加高尚了,Timestamps 不再需要,可它已经存在了。 这只是个时间差带来的误会。后面我会专门描述 RTT 的采集方法,今天又部核算,太累了,睡觉。 如果...
tcp_timestamps是在RFC 1323中定义的一个TCP选项。 这篇wiki介绍一下timestamps的设计目的和相关原理,尤其强调一些比较tricky的地方。 关于RFC1323 这是一篇介绍针对High-bandwidth, Long delay链路设计的一些TCP扩展选项的资料。强烈推荐阅读! 但这篇RFC其实已经被RFC7323所取代,不过RFC1323对于了解timestamp相关的基本...
Tcp1323Opts Key:Tcpip\Parameters Value Type:REG_DWORD—number (flags) Valid Range:0 or 2 0 (disable the use of the TCP timestamps option) 2 (enable the use of the TCP timestamps option) Default:No value. Description:This value controls the use of the RFC 1323 TCP Timestamp option....
可能大家会有这样的疑问，为什么 PAWS 检查要放过过期的 RST 报文。我翻了 RFC 1323 ，里面有一句提到：It is recommended that RST segments NOT carry timestamps, and that RST segments be acceptable regardless of their timestamp. Old duplicate RST segments should be exceedingly unlikely, and their ...
and get vulnerability, TCP TimestampsSummary The remote host implements TCP timestamps and therefore allows to compute the uptime. Vulnerability Detection Result It was detected that the host implements RFC1323.The following timestamps were retrieved with a delay of 1 seconds in-between: Packet 1...
等保tcp时间戳 低风险就是 RFC 1323 时间戳查看状态:netsh int tcp show global开启方式:netsh int tcp set global timestamps=enabled禁用方式:netsh int tcp set global timestamps=disabled 代码语言:javascript 代码运行次数:0 运行 AI代码解释 C:\Windows\system32>netsh int tcp show global ...